\documentclass[crop, tikz]{standalone}
\usepackage{tikz}

\usetikzlibrary{positioning}

\begin{document}
\begin{tikzpicture}
	
	\draw[ultra thick, lightgray, dashed] (5.5, 2) -- (5.5, -2);
	\node[circle,inner sep=0.3em,fill=red,very thick] (X) at (4.5, 0.5) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (4.7, 0.1) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (5.2, 0.1) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (5.1, -0.3) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (5.6, -0.33) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (5.4, -0.7) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (5.8, -0.9) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (5.9, -1.3) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (6.4, -1.2) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (6.9, -1.1) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (7.4, -1.3) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (7.45, -1.7) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (7.8, -1.5) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (8.2, -1.4) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (8.3, -1.0) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (8.6, -1.3) {};
	
	\node[circle,inner sep=0.3em,fill=blue,very thick] (Y) at (6.5, 0.5) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (6.1, 0.8) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (5.7, 0.9) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (5.8, 1.3) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (5.4, 1.15) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (5, 1.2) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (4.8, 1.5) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (4.3, 1.6) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (4.2, 1.2) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (3.8, 1.3) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (3.4, 1.3) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (3.4, 0.8) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (3.1, 1.1) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (2.75, 0.7) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (2.45, 0.1) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (2.35, 0.45) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (1.9, -0.04) {};
	\node[circle,inner sep=0.3em,fill=gray,very thick] (Y) at (1.85, -0.5) {};
	
	\draw[ultra thick, black, dashed](1.5,-1) cos
    (3,0) sin (4.5,1) cos (6,0) sin (7.5,-1) cos (9,0);
    
\end{tikzpicture}
\end{document}